Knife grinder and buffer.



N. PETERSON. KNIFE-GRI DER, AND BUFFER. APPLICATION FILED AUG. 23. 1909.

973,457. I I Patented-Oct. 18,1910,

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THE NDRRI! PETERS co, WASHINGTON, n. c.

' N. PETERSON.

KNIFE GRINDER AND BUFFER.

APPLICATION FILED AUG. 23, 1909.

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Patented Oct. 18, 1910.

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Qftomup Tux NORRIS FITIIS :o., WIIIIHUYON. n4 2:.

UNITED STATES PATENT OFFICE.

NELS PETERSON, OF OSTRANDER, MINNESOTA.

KNIFE GRINDER AND BUFFER.

1'0 all whom it may concern:

Be it known that I, New PETERSON, a citizen of the United States,residing at Ostrander in the county of Fillmore, State of Minnesota,have invented certain new and useful Improvements in Knife Grinders andBuffers; and I do hereby declare the following to .be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to grinding and scouring machines and has specialreference to a machine adapted to grind and scour flat bladed knivessuch as the cutlery commonly used on tables and in kitchens and butchershops.

One object of the invention is to improve the general construction ofknife grinders and scourers.

Another object of the invention is to provide an improved means ofdriving the adjustable rolls common in such devices.

A third object of the invention is to provide an improved rest for thegrinding means.

lVith the above and other objects in View the invention consists ingeneral of a frame whereon are mounted certain grinding and polishingrolls, together with means for driving the same and a suitable rest forthe implement being ground and polished.

The invention further consists in certain novel details of constructionand combinations .of parts hereinafter fully described,

- acters of reference indicate like parts in the several views, and::Figure 1 is a front elevation of .a grinding and scouring machineconstructed in accordance with this invention. Fig. 3 is a section onthe line 3-3 of Fig. 2. Fig. 4 is a section on the line 4-4 of Fig. 1.Fig. 5 is an enlarged detail View of the knife rest used with thegrinding wheel. Fig. 6 is a detail showing a stub shaft used forsupporting a hand wheel used in this invention.

The numeral 10 indicates the base of this like yieldable material, thepurpose of the legs being to prevent scouring of a table by setting thegrinder thereon.

Specification of Letters Patent.

Application filed August 23, 1909.

Fig. 2 is a side elevation thereof.

PatentedOct. 18, 1910.

Serial No. 514,161.

Mounted on the base 10 adjacent the front thereof is a frame whichconsists of a bar of metal bent to form an upstanding member 12, a basemember 13, a second upstanding member 14 which is in spaced relation andparallel to the member 12, a rearwardly extending-portion 15 and adownwardly and forwardly extending portion 16. This latter portion 16terminates against the portion 14 and the base and is secured to thebottom of the portion 14 by means of a stud 17 andrivets 18 which passthrough the portions 14 and 16 and the stud 17. Secured to the portion14 of this mainframe is a rearwardly extending bar 19 which is providedwith an aperture20. A rear standard 21 is secured to the base andextends up adjacent the rear end of the member 19,being provided at itsupper end with an aperture 22 which registers with the aperture 20..Held in the apertures 20and 22 in a stub shaft having a body portion 23provided with .a reduced and threaded end 24. The body portionis held inthe apertures above mentioned and the reduced and threaded end 24projects therethrough. On this reduced and threaded end is carried awasher 25 and a nut 26 which serve to hold the stub shaft securely inthe members 19 and 21 and also to hold said members securely fixedtogether. Oposite the threaded end 24 the body is provided with a.collar 27 which bears against the outer face of the member 119 andbeyond this collar is formed a journal 28 provided with a reduced andthreaded end 29 whereon is held a washer 30 and nut 31. Between thewasher 30 and collar 27 is the hub of a hand wheel 32 which is providedwith a handle 33 for the purpose of rotating the same and has a groovedface 34 for the purpose of receiving a round belt 35, the object ofwhich will be hereinafter explained. By means of this construction avery strong and rigid frame is provided while at the same time theconstructionis extremely simple. The portions 12 and 14 of the frame areprovided adjacent their lower ends with bearings 36 wherein is held ashaft 37 which projects beyond the portions 12 and-14 at both ends.Between the portions 12 and 14 the shaft has mounted thereon a buflingwheel 38 of felt or other suitable material and this buffing wheel isarranged to rotate as the shaft rotates. Above the bearings 36 theportions 12 and 14 are provided with slots 39. Slidv able in the slots39 are bearing blocks 40 each of which is provided with lips 41 whichproject over the edges of the slots so that these slots are held inposition. In the construction of these blocks one side of the same isdetachable and is held thereon by means of suitable rivets not deemednecessary here to be shown. This construction is made necessary in orderto fit the blocks within the slots 39. Attached to the blocks 41 andmovable therewith are cover plates 42 which serve to close the lowerends of the slots 39. Held between the blocks 40 and the bottoms of theslots 39 are compression springs 43 which normally serve to raise thebearing blocks 40 and force them toward the top of the slots. At theupper end of each of the portions 12 and 14 and in alinement with theslots 39 are threaded apertures 44 wherein are held adjusting screws 45.The lower ends of these adjusting screws bear on the bearing blocks 40and by means of rotating these screws the bearing blocks may be causedto move downward in the slots, the springs acting to raise them when thescrews are rotated in the opposite direction. lVithin the bearing blocks41 is supported a shaft 46 whereon is held a bufiing wheel 47 of similarcharacter to the bufl ing wheel 38 previously described. Upon each ofthe shafts 37 and 46 are held grooved belt pulleys 47 and 48respectively and the belt 35 previously described is led from the upperside of the wheel 32 beneath and around the pulley 48 from whence it isled in front of and around the pulley 47. By means of this arrangementof drive the revolution of the pulley 32 in the direction of the arrowwill cause the bufling wheels to revolve in the directions of the arrowsshown thereon. Furthermore, by means of this arrangement it will beobserved from an inspection of Fig. 2 that the adjusting of the blocks40 will not in any way relieve the tension on the belt 35. In order tokeep this tension at the proper degree there is mounted on the portion16 of the frame an arm 49 having a slot 50 therein wherethrough passesan adjusting bolt 51. On the end of this arm opposite the slot is anidler pulley 52 and the belt 35 runs from the belt pulley 48 over thisidler pulley. By means of the adjusting bolt 51 the arm 49 may be variedin position so as to maintain a proper tension on the belt 35 at alltimes.

In front of the buffing wheels 38 and 47 is a guard plate. This guardplate is formed with a base portion 53 securely fastened to the base 10and from this base portion the guard plate curves upward around theforward side of the butfing wheel 38 until it reaches a point adjacentthe members 12 and 14 where it is supported by means of suitable clips54. From this point it springs outward again and curves closely around aportion of the butting wheel 47. These two curved portions are indicatedrespectively at 55 and 56 and in the cusp formed between the two thereis provided a knife retaining slot 57.

The shaft 37, as before noted, projects through the member 12 and on theouter end of the shaft is supported an abrading wheel 58 of emery orother suitable material. Adjacent this abrading wheel is supported astandard 59 which is bolted to the base 10 and at the upper end of thisstandard is a pivot bolt 60. Pivotally mounted on the bolt 60 is a rest61 provided with an arcuate slot 62 and a locking screw 63 passesthrough this slot and the member 59 for the purpose of clamping the rest61 in adjusted position. The rest 61 is provided with slots 64 extendingfrom its upper edge downward for the purpose of receiving a knife bladeso that the same may be held in proper position relative to the abradingwheel 58.

In the operation of this device when it is desired to grind the knifethe same is placed in one of the slots 64 and the rest 61 adjusted untilthe knife lies in the proper angle against the abrading wheel 58. Thehandle is then turned and this causes the abrading wheel to revolve. Theknife is drawn back and forth in the slot 64 wherein it is placed untilone side of the edge has been sufficiently ground when it may betransferred to the other slot 64 and the other side of the edge groundin like manner. After having been ground the blade may be polished byinsert ing the same in the slot 57 between the buffing wheels 38 and 47and adjusting the thumb screws 45 to obtain the proper degree ofpressure on the blade. The handle is again revolved and the knife drawnin and out of the slot 57 between the bufiing wheels thus giving it arapid and effective polish. The rest may be also used for grindingscissors and the like by properly positioning them upon the upper edgethereof.

There has thus been provided a simple and efficient device of the kinddescribed and for the purpose specified.

It is obvious that minor changes may be made in the form andconstruction of this invention without departing from the materialprinciples thereof. It is not therefore desired to confine the inventionto the exact form herein shown and described, but it is wished toinclude all such as properly come within the scope of the appendedclaim.

Having thus described the invention, what is claimed as new, is 2- In adevice of the kind described, a base platform, and a supporting framecomprising a length of bar metal consisting of an upstanding sideportion, a portion bent at right angles thereto to form a base attachedto said platform, a portion bent at right angles to the base to form anupstanding side portion, a portion extending rearwardly fromthelastmentioned side portion, and a terminal extending downwardly andforwardly to the lower end of the second upstanding portion; a strapsecuring said ter- 111mm to said side portion, a bar secured to andprojecting rearwardly from the rear- 10 ward portion of the first bar;and a support secnred to the rear end of the last mentioned bar andextending downward to the base platform and secured thereto.

In testimony whereof, I affix my signature, in presence of twowitnesses.

NELS PETERSON.

WVitnesses O. THORSON, P. HENDRIOKSON.

